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Why 3×3=9, not 10?

Z+3+3=9.The same in multiplication, instead of indefinitely not to put large numbers can simply be multiplied.For example, 22 times 21.You have 22 times to write the number 21 and then folding.You can simply multiply\r\n\r\nThis even the multiplication table, 3 by 3 is 9, and not otherwise.
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